Shaker-screen.



W. BRASACK.

SHAKER SCREEN.

APPLICATION FILED APR. 3, 1916.

.1 ,2 14,596 Patented Feb. '6, 1917.

FIG.

wnzmam BRASACK, or rammon'r, WEST VIRGINIA, ASSIGNOR r0 FAIRMON'J.MINING MACHINERY eomram, A CORPORATION or wEs'r VIRGINIA.

SHAKER-SCREEN.

To aZZ whom it may concern:

Be it known thatI, WILLIAM BRASAOK, a citizen of the United States,residing at Fairmont, in the county of Marion and Y State of WestVirginia, have invented certain ciprocating shaker screens, butparticularly, 1

to a device adapted to be associated with such screens for facilitatingtheir mode of operation.

In order to exemplify a preferred embodiment of the invention, as wellas to disclose the operating theory of the principle involved, attentionis directed to the accompanying drawing, in which Figure 1 is a sideelevation of a shaker screen illustrating the application of theinvention, and Fig. 2 is a bottom plan view.

In carrying out the preferred embodiment of the invention the shakerscreen preferably comprises two independent screen sections A and Bsuitably suspended by a series of hangers C. The screen sections areadapted to reciprocate in opposite directions, and in order to impartthe reciprocating motionto the sections, each one is connected to a rodD, preferably at a pomt midway between its sides such as at E. Each rodis in turn connected to an eccentric F which is mounted on a commondrive shaft G with its highest point diametrically opposite the highestpoint on the other eccentric. With this construction, the necessaryreciprocating emotion may be imparted to the screen sections in such amanner as Y to cause them to move in opposite directions, that is tosay, when section A moves to the right, the section B will move to theleft, and vice versa. In the physical embodiment of the screen asproposed In the preferred form of the invention, a doublestroke of boththe sections is about five inches, and the number of double strokes ofeach section is about one hundred per minute.

Should the screen, as above described, be used without the devicecontemplated by the present invention, it would require a certain amountof energy for each section to accelerate from a standstill to itsmaximum velocity, and this amount of energy which would necessarily bestored in the Specification of letters Patent.

Patented Feb. 6, IlQiW.

Application filed April 3, 1916. Serial No. 88,635.

sections when they reach their maximum velocity, would be destroyed,when the sections come to a standstill. This continuous storing anddestroying of energy occurs at every stroke, or two hundred times p,'erminute. It is therefore proposed by the present invention to preservethe energy thus destroyed and reduce the motive power required to impartthe reciprocating motion to a minimum. To accomplish these ends, anenergy storing means is employed for absorbing the potential energy ofthe reciprocating sections at the time that they are being retarded, andthen converting it into kinetic energy when the sections are beingaccelerated. In accordance with the present invention, this energystoring means preferably comprises a helical spring H, or a series ofsuch springs which are interposed beneath the confronting ends of thetwo sections and suitably supported in a horizontal position between apair of blocks 7 central position, the spring or springs will Y bewithout tension.

In operation, when the section A moves to the left and the section Bmoves to the right, a certain tension will be imparted to the spring orsprings, which force will be expended again when the screens return totheir central or normal position, and the section A will then move tothe right, and section B to the left, thus compressing the spring orsprings. This energy will be utilized again when the sections return totheir central or normal position. It is to be seen that the spring orsprings are extended and compressed at every double stroke of-thesections. Y In realizing vention, it is to be seen that the device isnot only a practical one, but simple of construction, cheap to produceand durable in service. i

, I claim 1. In combination, a shaker screen, embodying in itsconstruction oppositely moving screening sections, means for positivelymoving theisections; and energy absorbing and storing means carried bysaid sections adapted to absorb their potential'energy at the period ofretardation, and later convert the energy thus absorbed into kineticenergy the characteristics of the in- I at the period of acceleration,said energy absorbing and storing means comprising a spring membermounted between confront ing portions of two of said sections and withits respective ends fixed to said sections.

2. In combination, a shaker screen, embodying in its constructionoppositely moving screening sections, means for positively moving thesections; and energy absorbing and storing means carried by saidsections adapted to absorb their potential energy at the period ofretardation, and later convert the energy thus absorbed into kineticenergy at the period of acceleration, said energy absorbing and storingmeans comprising a spring member mounted beneath the confronting ends oftwo of said sections parallel to the line of their movement and with itsrespective ends attached to blocks carried by said sections.

3. In combination, a shaker screen, em-

bodying in its construction oppositelymovreciprocating screeningsections, means imparting to said sections simultaneously, movements inopposed directions and resilient means carried by and adapted to beacted upon by both of said sections in each direction of itsreciprocation, absorbing the potential energy of said sections atperiods of retardation in their movement and giving back said energy atperiods of their acbodyingin its construction oppositely movingscreening sections, means for positively moving the sections; and energyabsorbing and storing means carried by said sections adapted to absorbtheir potential energy at the period of retardation, and later convertthe energy thus absorbed into kinetic energy at the period ofacceleration, said energy absorbing and storing means comprising aspring member mounted between confronting portions of two of saidsections and with its respective ends fixed to said portions, saidspring acting resiliently upon said confronting portions by both tensionand compression.

6. In combination, a shaker screen, embodying in .its constructionoppositely moving screening sections, means for positively moving thesections; and energy absorbing and storing means carried by saidsections adapted to absorb their potential energy at the period ofretardation, and later convert the energy thus absorbed into kineticenergy vat the period of acceleration, said energy absorbing and storingmeans comprising a spring member mounted between confronting portions oftwo of said sections and wlth its respective ends fixed to saidportions, the

means for moving the screening sections being offset from the plane ofthe screens and confronting portions projecting rigidly from thescreening sections on the same side of their plane as the means formoving them,

.whereby tipping influence of the moving means is opposed.

The foregoing specification signed at Fairmont, W. Va., this 2nd day ofMarch, 1916.

WILLIAM BRAsAoK.

